Windows 8.1 64 Bit Not Working on Some Old AMD Processors

It has been revealed that the older versions of AMD processors might be useless with the latest Microsoft Windows 8.1 64 bit. This piece of information was recently revealed to Neowin by Microsoft itself when it stated that all the older AMD processors will face issues while trying to run Windows 8.1 64 bit. Some of these AMD processors have been named by Microsoft such as the elderly Athlon 64, Athlon x2 64 or the Opteron 185.